2008-2014 Scion xD Timing Cover: Decoding the Common 2ZR-FE Oil Leak
This guide covers the symptoms, repair costs, and critical inspection points for the timing cover on the 1.8L 2ZR-FE engine.
- The primary failure is a leak from the sealant, not the cover itself, making a used OEM cover a smart buy.
- This is a very labor-intensive repair (8-12 hours), and costs of $1,500+ are common. Labor is the main expense.
- Always replace the water pump, front crankshaft seal, and related gaskets during this job. If mileage is high, replace the timing chain set as well.
- Before committing to this repair, confirm the leak isn't from the much simpler-to-fix timing chain tensioner gasket.
Symptoms of a Failing Timing Cover
The timing cover itself is a very durable component; failure almost always refers to a leak from the gasket or sealant that seals it to the engine block. The 2ZR-FE engine is known for developing this specific leak over time.
- Oil Leaks: The most common symptom is engine oil seeping from the edges of the timing cover. This often starts as an oily residue or "sweat" on the passenger side of the engine and can progress to active drips on the ground.
- Burning Oil Smell: As oil leaks from the cover, it can drip onto the hot exhaust manifold or other engine parts, causing a distinct burning oil smell, especially after a long drive.
- Low Engine Oil Level: A persistent leak will cause the engine oil level to drop over time. If not monitored, this can lead to serious engine damage.
- Visible Sealant Failure: In some cases, you may see bits of the old, hardened RTV sealant being pushed out from the seam between the cover and the engine block.
Pro Tip: Before assuming a major timing cover leak, first inspect the timing chain tensioner. It is located on the back of the cylinder head on the passenger side. A leak from the tensioner's gasket is very common on the 2ZR-FE engine and can be mistaken for a timing cover leak, but it is a much simpler and cheaper repair.
Known Issues, Recalls, and Service Bulletins
As of mid-2026, there are no active recalls or Technical Service Bulletins (TSBs) from Toyota or the NHTSA specifically for a leaking timing cover on the 2008-2014 Scion xD. However, the oil leak from the timing cover sealant is a widely recognized issue among technicians and owners of vehicles with the 2ZR-FE engine.
While not directly related to the timing cover, other common issues with the 2ZR-FE engine include:
- Excessive Oil Consumption: Some earlier models (around 2008-2010) were known to burn oil due to piston ring design. This is an internal issue, separate from an external timing cover leak.
- Water Pump Failure: The water pump can fail and leak coolant. Since the pump is mounted to the timing cover, it is highly recommended to replace the water pump during a timing cover job.
Buying a Used Timing Cover: What to Check
Because the timing cover itself is a simple, non-moving part, a used OEM cover is an excellent way to save money. The failure is almost always the sealant, which must be replaced during the installation anyway. A used OEM part is often superior to a cheap new aftermarket part that may have casting flaws or improper dimensions.
- Check for Cracks: Carefully inspect the entire cover, especially around the bolt holes and mounting bosses for accessories. Stress cracks can form if the engine was in a collision or if a bolt was over-torqued.
- Inspect Sealing Surfaces: Run your finger along all the flat surfaces where the cover meets the engine block, cylinder head, and oil pan. These surfaces must be smooth and free of deep scratches, gouges, or warping that could prevent a good seal.
- Verify All Threads: Check the threaded holes for the water pump, alternator, and engine mount. Make sure none are stripped or damaged. Repairing stripped threads in aluminum can be difficult.
- Confirm Part Number: The primary OEM part numbers are 11310-37020 and 11310-37021. The latter number supersedes the former. This cover fits the 1.8L 2ZR-FE engine found in the Scion xD, as well as the 2009+ Toyota Corolla and Matrix, offering a wide range of potential donor vehicles.
Replacement Difficulty and Labor
Replacing the timing cover on a Scion xD is a difficult and labor-intensive job. It is not recommended for an inexperienced DIY mechanic.
- Difficulty Rating: 5 out of 5
- Estimated Time: 8-12 hours
- DIY Feasibility: Not recommended for beginners. The process requires removing the engine mount, serpentine belt, alternator, water pump, and the crankshaft pulley, which requires a special puller tool.
Warning: The reinstallation process is critical. All old sealant must be meticulously cleaned from both the cover and the engine block. New RTV sealant must be applied correctly. Most importantly, a small O-ring for an oil passage must be installed properly. Failure to do so can block oil flow and cause catastrophic engine failure.
Cost to Replace the Timing Cover
The cost is dominated by labor. Since the part itself rarely fails, a used OEM cover is a smart choice to manage costs. The following prices are estimates and can vary by location and shop.
| Part/Service | Estimated Cost |
|---|---|
| Shop Labor | $900 - $1,500+ |
| New OEM Cover | $450 - $500 |
| New Aftermarket Cover | $90 - $230 |
| Used OEM Cover | $75 - $150 |
| Related Parts (Gaskets, Seals, Fluids) | $100 - $200 |
Frequently Asked Questions (FAQ)
Can I use an oil stop-leak additive to fix my timing cover leak?
It is not recommended. Stop-leak products work by swelling rubber seals. The timing cover on the 2ZR-FE engine uses a Formed-in-Place Gasket (FIPG), which is a type of RTV silicone. These additives will not fix the leak and can potentially clog small oil passages in the engine, leading to much bigger problems.
Do I have to replace the timing chain and water pump at the same time?
It is highly recommended. The water pump must be removed to get the timing cover off, so you only pay for the part, not extra labor. If your engine has over 100,000 miles, it is wise to also replace the timing chain, tensioner, and guides, as all the labor to access them has already been done.
Is it safe to drive with a leaking timing cover?
If the leak is a very slow seep or weep, you can likely continue to drive, but you MUST check your engine oil level frequently (at every fuel fill-up) and top it off as needed. If the leak becomes a steady drip, you should get it repaired as soon as possible to avoid the risk of running the engine low on oil, which can cause complete failure.
My mechanic quoted $1,700 for the repair. Is that too high?
A quote in the range of $1,500 to $2,000 from a dealership or reputable independent shop is common for this job. The repair is very labor-intensive, with book times often exceeding 10 hours. Always get a second opinion, but be aware that this is an expensive repair due to the high amount of labor involved.
Technical Specifications
OEM Part Numbers: 11310-37020 11310-37021
Material: Cast Aluminum. Fits 1.8L 2ZR-FE engine only. Integrally houses the water pump.
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Scion xD: